Modern surgery, general and operative . Fig. 44.—Normal vessels and blood-stream. Fig. 45.—Dilatation of the vessels in inflammation. Active Hyperemia.—^When an irritant is applied to tissue there maybe a momentary arterial contraction due to irritation of the nerves, but thiscontraction is transitory, and is not an inflammatory phenomenon. Thefirst vascular phenomenon is dilatation of all the vessels—capillaries, venifles,and arterioles—appearing first and being most pronounced in the smallarteries. As a result of the dilatation there are increased rapidity of circula-tion and increased deter
Modern surgery, general and operative . Fig. 44.—Normal vessels and blood-stream. Fig. 45.—Dilatation of the vessels in inflammation. Active Hyperemia.—^When an irritant is applied to tissue there maybe a momentary arterial contraction due to irritation of the nerves, but thiscontraction is transitory, and is not an inflammatory phenomenon. Thefirst vascular phenomenon is dilatation of all the vessels—capillaries, venifles,and arterioles—appearing first and being most pronounced in the smallarteries. As a result of the dilatation there are increased rapidity of circula-tion and increased determination of blood to the part, and the area of hyper-emia becomes warmer than is normal. This condition of increased circulatoryactivity is known as active hyperemia (Fig. 45). Active hyperemia is an increase in the amount of moving blood in a hyperemia is an increase in the amount of blood in a part, but not ofmoving blood, as passive hyperemia or congestion is due to venous obstruction,and the blood is stagnate
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Keywords: ., bookcentury1900, bookdecade1910, bookpublishe, booksubjectsurgery
